Proton and cesium conductivity in perfluorosulfonate ionomers at low and high relative humidity
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2017
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Solid State Ionics
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Nafion exhibits one of the highest proton conductivity at room temperature and it is the standard electrolyte of
proton exchange membrane fuel cells (PEMFC). However, the temperature dependence of ionic conductivity of
Nation is highly dependent on the measuring conditions and it is still a matter of debate. In the present study, detailed
dielectric spectroscopy (DS) measurements in both dry (under N2 flow) and water-saturated conditions
were carried out in a broad range of temperature and frequency. Such DS results were correlated to differential
scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) data taken in similar conditions. The main
results revealed that in samples conditioned in N2 flow (RH ~0%) the transport of both proton and cesiumions is
coordinated with the dynamics of Nafion relaxations. In hydrated Nafion (proton form), conductivity measurements
at different frequencies revealed two regimes: one at high-frequency, in which the Vogel-Tamman-
Fulcher (VTF) law indicates a close relation between the polymer glass transition temperature Tg; and, a second
one at low frequency, bearing great similarity to the transport observed in nearly dry samples. The reported experimental
results contribute to disentangle the intricate transport properties of Nafion.
Como referenciar
MATOS, BRUNO R.; SILVA, JAQUELINE S. da; SANTIAGO, ELISABETH I.; PARRA, DUCLERC F.; CARASTAN, DANILO J.; FLORIO, DANIEL Z. de; ANDRADA, HEBER E.; CARRERAS, ALEJO C.; FONSECA, FABIO C. Proton and cesium conductivity in perfluorosulfonate ionomers at low and high relative humidity. Solid State Ionics, v. 301, p. 86-94, 2017. DOI: 10.1016/j.ssi.2017.01.019. Disponível em: http://repositorio.ipen.br/handle/123456789/27754. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.